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Q.

Five moles of an ideal gas expands reversibly from a volume of 8 dm3  to 80 dm3 at a temperature of 270C. Calculate the change in entropy.

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a

70.26 JK-1

b

82.55 JK-1

c

95.73 JK-1

d

107.11 JK-1

answer is C.

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Detailed Solution

Entropy change ∆S=2.303 nR  log V2V1                =2.303×5×8.314 × log 80V1=95.73 JK-1
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Five moles of an ideal gas expands reversibly from a volume of 8 dm3  to 80 dm3 at a temperature of 270C. Calculate the change in entropy.